Boston Marathon Explosions: Wednesday’s Developments

Throughout the day, we’ll be updating with the latest news about the two explosions Monday near the finish line of the Boston Marathon. The blasts killed at least three people — one of them an 8-year-old boy — and injured more than 170. We’ll also be publishing related posts as the day continues. (See this note about how we cover events such as this.)

6:45 a.m. ET. Where Things Stand.

INVESTIGATION: FBI Special Agent in Charge Richard DesLauriers said Tuesday that investigators have recovered pieces of one bomb. DesLauriers said “BBs and nails,” which may have been inside a pressure-cooker style bomb, have been sent to Quantico, Va. for analysis. The Associated Press says investigators also “found pieces of an electronic circuit board possibly indicating a timer was used in the detonation of the bomb.”

NPR’s Dina Temple-Raston reports that an official familiar with the investigation told her the bomb was “a pressure cooker design with nails and ball bearings inside.” And Dina said on Morning Edition Wednesday that FBI investigators think the key clue to finding who’s responsible may come from a photo or video taken by a spectator — evidence that “people don’t know is important, but the FBI looks at and seems some clue.” At the website of the FBI’s Boston Division, officials have posted this appeal for help: “If you have any information that could be of assistance, please call 1-800-CALL-FBI (prompt #3). No detail is too small.”

President Obama told reporters Tuesday that it’s clear this was an “act of terrorism,” but that it’s not known yet whether it was the act of an individual or a group, and whether it was foreign- or domestic-related.

Also on Morning Edition, NPR’s Tom Gjelten reported about “soft targets” such as marathons and the steps authorities take to protect them.

DEATHS, INJURIES: Two of the three people who were killed have been identified: Martin Richard was 8 years old and Krystle Campbell was 29. A third victim is reported to be a Chinese citizen who was studying at Boston University. The school says “the student’s name has not been released, pending permission to do so from the family. The student was one of three friends who watched the race near the finish line. Another of the three students, also a BU grad student, was injured and is in stable condition at Boston Medical Center.”

At least 176 people were injured, according to Boston Police. As of Tuesday, at least 17 of the wounded were in critical condition. Related post on the Shots blog: “Boston Doctors Compare Marathon Bomb Injuries To War Wounds.”

For More:

Tuesday’s Developments.

NPR’s Coverage.

Note: As happens when stories such as this are developing, there will likely be reports that turn out to be mistaken. Monday, for example, authorities at one point said they thought there had also been an explosion at the JFK Library in Boston. But it turned out there had been a fire, not an explosion, and there’s no known link at this time to the marathon attacks.

We will focus on news being reported by NPR, other news outlets with expertise and statements from authorities in position to know what’s going on. And if some of that information turns out to be wrong, we’ll update.

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